Samsung LN52A550P3FXZA Troubleshooting

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4. Troubleshooting

4. Troubleshooting

4-1. Troubleshooting

4-1-1. Previous checkCheck the various cable connections first. • Check to see if there is a burnt or damaged cable. • Check to see if there is a disconnected or loose cable connection. • Check to see if the cables are connected according to the connection diagram.

Check the power input to the Main Board.

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4. Troubleshooting

4-1-2. No Power

SymptomThe LEDs on the front panel do not work when connecting the power cord.The SMPS relay does not work when connecting the power cord.The units appears to be dead.

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Major checkpoints

The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:

Check the internal cable connection status inside the unit.Check the fuses of each part.Check the output voltage of SMPS.Replace the Main Board.

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Diagnostics

Yes

Does proper Main DC B13V,B12V,B5V appear at BD105L,C1261,BD101?

Does proper DC STB3.3Vappear at C101?

Check IC105 Change the Main assemblyBN94-01628C

No

Yes

Does proper DC D3.3V,B8V,CORE1.1V appear at C108,C110,C137?

No

Yes

Lamp(Backlight) Off, power indicator LED on?

Yes

No Check power cable.P/N: BN39-00702F

Does proper Stand-By DC STB5Vappear at BD100? No

Change the Main Power assemblyBN44-00202A

Yes

No

Does proper Inverter DC 120V appearat CN801 in IP?

YesNo

Check IC101,IC108,IC102 Change the Main assembly

BN94-02077B

Does proper D1.8V,A2.5V,A1.2Vappear at C115, C111, C112?

No

Yes

Check IC104, IC106, IC107Change the Main assembly

BN94-02077B

A power is supplied to set?No

Check a other function (No picture part)Replace a LCD Panel

BN07-00518A

Caution Make sure to disconnect the power before working on the IP board.

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4. Troubleshooting

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4. Troubleshooting

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4. Troubleshooting

4-1-3. No Video (Analog PC signal)

Symptom Audio is normal but no picture is displayed on the screen.-

Major checkpoints

Check the PC sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Check CN1000, PC cable.Change the PC cable. Change the main

PCB assembly

No

Yes

Does the digital data appear atoutput of R721~R740,R788~R791?

No

Yes

Power Indicator is off.Lamp on, no video

Yes

Check the PC source andcheck the connection of DSUB? No

Input an analog PC signal.Check the connected cable.

Yes

Check IC400Change the main PCB assembly

Check the LVDS cable?Replace the LCD panel? Please, Contact 1 800 Samsung

No

Does the signal appear at#AE18,#AE17,#AF16,#AC16,#AB17

(R, G, B, H, V) of IC400?

Does the digital data appear at outputof R1109, R1110, R1113P, R1114P, R1116P, R1120P, R1122~R1128,R1133, R1135, R1137P~R1141P,

R1143~R1150?

No Check IC1101Change the main PCB assembly

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Yes


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4. Troubleshooting

WAVEFORMS

1 2 PC Input (V-Sync, H-Sync)

3 LVDS Out (CLK + / -)

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4. Troubleshooting

4-1-4. No Video (HDMI - Digital Signal)


Major checkpoints

Check the HDMI sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Check JA1000,JA1002, HDMI cable.Change the HDMI cable. Change

the main PCB assembly

No

Yes

Does the digital data appearat output of R721~R740,R788~R791?

No

Yes

Power Indicator is off.Lamp(Backlight) Off, no video

Yes

Check the HDMI source and check the connection of HDMI cable? No

Input an HDMI signal.Check the connected cable.

Yes


Yes


No

Does the signal appear at R1027, R1029, R1034, R1036, R1040, R1042, R1063, R1065, R1067, R1069,

R1071, R1073(DATA), R1020, R1023, R1059, R1061(Clk+/-)?

Does the digital data appear at outputof R1034-7, R1039, RA061~063,

RA065, RA067, RA068?


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4. Troubleshooting

WAVEFORMS

4 5 HDMI Input (CLK + / -)

6 Tuner CVBS Out (Pattern: Grey Bar)

7 TS DATA Out (Clk, Data [0])

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4. Troubleshooting

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4. Troubleshooting

4-1-5. No Video (Tuner_CVBS)


Major checkpoints

Check the Tuner CVBS sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Check TU301Change the main PCB assembly or tuner.

No

Yes

No

Yes


Yes

Check the RF source andcheck the connection of RF cable?

No Input the RF signal.Check the connected cable.

Yes


Yes


No

Does the digital data appear at outputof R721~R740, R788~R791?

Does the digital data appear at outputof R1109, R1110, R1113P, R1114P, R1116P, R1120P, R1122~R1128, R1133, R1135, R1137P~R1141P,

R1143~R1150?


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Does the signal appear at TU301?


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4. Troubleshooting

WAVEFORMS



8 Eagle+ Out (Clk, H-Sync)

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4. Troubleshooting

4-1-6. No Video (Tuner DTV)


Major checkpoints

Check the DTV sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Yes


Yes

Check the RF source andcheck the connection of RF cable?

No Input the RF signal.Check the connected cable.

Yes

Check the LVDS cable?Replace the LCD panel? Please, Contact 1 800 SamsungNo

Does the digital data appear atoutput of R721~R740,R788~R791?


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Yes


R1143~R1150?

No Check IC400Change the main PCB assembly7


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4. Troubleshooting

WAVEFORMS



8 Eagle+ Out (Clk, H-Sync)

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4. Troubleshooting

4-1-7. No Video (Video CVBS)


Major checkpoints

Check the Video CVBS sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Check CN7002 or Side-AVChange the main PCB ass’y or

Side-AV assembly

No

Yes


Yes

Check the video source andcheck the connection of

video cable?No Input a video signal.

Check the connected cable.

Yes


Does the digital data appear at outputof R721~R740,R788~R791?


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Does the signal appear at C702 of IC400?

Yes

Does the digital data appear at outputof R1109, R1110, R1113P, R1114P, R1116P, R1120P, R1122~R1128, R1133, R1135, R1137P~R1141P,

R1143~R1150?


Yes

Caution Make sure to disconnect the power before working on the SMPS board.

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4. Troubleshooting

WAVEFORMS



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4. Troubleshooting

4-1-8. No Video (S-Video 1, 2)


Major checkpoints

Check the S-Video sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Check CN901B or Side-AVChange the main PCB ass’y or

Side-AV assembly

No

Yes


Yes

Check the video source andcheck the connection of

video cable?No Input a video signal.


Yes


Does the digital data appear at outputof R721~R740,R788~R791?


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Does the signal appearat C706, C707 (Y, C) of IC400?

Yes

Does the digital data appear at outputof R1109, R1110, R1113P, R1114P,R1116P, R1120P, R1122~R1128,R1133, R1135, R1137P~R1141P,

R1143~R1150?


Yes


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4. Troubleshooting

WAVEFORMS



9 S-VIDEO Input (Y/C)

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4. Troubleshooting

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4. Troubleshooting

4-1-9. No Video (Component 1, 2)


Major checkpoints

Check the Component sourceCheck the MT5382This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

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Diagnostics

Check CN173, CN7002Change the main PCB assembly

No

Yes


Yes

Check component source and check the connection of

component cable?No Input a component signal.


Yes


Does the digital data appear at outputof R721~R740, R788~R791?


6

Does the signal appear at C715, C719, C716, C720, C717, C721

(Y, Pb, Pr) of IC400?

Yes


R1143~R1150?


Yes

0


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4. Troubleshooting

WAVEFORMS



0 Component Input (Y/Pb)

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4. Troubleshooting

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4. Troubleshooting

4-1-10. No Sound

Symptom Video is normal but there is no sound..-

Major checkpoints

When the speaker connectors are disconnected or damaged.When the sound processing part of the Main Board is not functioning.Speaker defect..

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Diagnostics

Check IC400 or Side-AV.Change the main PCB ass’y or

side-AV assembly

No

Yes

Picture is display, no sound.

Yes

Check component source andcheck the connection of

component cable?No Input a component signal.


Yes


Does the digital data appear at#27~#30 (Mclk, Sclk, LRclk, data)

of IC1203?


@

Does the signal appear at C762~C771 of IC400?

Yes

Does the signal appear atL1201, L1202 (L/R output)?

No Check IC1203Change the main PCB assembly#

Yes

!


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4. Troubleshooting

WAVEFORMS

! Audio Input (Sign Wave)

@ 12S Input (Clk, Data)

# Audio Amp Out (Sign Wave)

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4. Troubleshooting

4-2. Alignments and Adjustments

4-2-1. General Alignment InstuctionUsually, a color LCD-TV needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync.

Use the specified test equipment or its equivalent.

Correct impedance matching is essential.

Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test result.

Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.

Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.

To protect against shock hazard, use an isolation transformer.

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4. Troubleshooting

4-3. Factory Mode Adjustments

4-3-1 Entering Factory ModeTo enter ‘Service Mode’ Press the remote -control keys in this sequence :- If you do not have Factory remote - control

MUTEPower OFF 1 8 2 Power On

4-3-2 How to Access Service ModeUsing the Customer Remote

Turn the power off and set to stand-by mode

Press the remote buttons in this order; POWER OFF-MUTE-1-8-2-POWER ON to turn the set on.

The set turns on and enters service mode. This may take approximately 20 seconds.

Press the Power button to exit and store data in memory. - If you fail to enter service mode, repeat steps 1 and 2 above.

Initial SERVICE MODE DISPLAY State

ADC Expert D-Settings

ADC Target Expert Gray Scale

ADC Result Expert C-Space

Option Byte Expert Others

White Balance CHECKSUM 0x0000

W/B Movie VisualTEST

EPA Standard Font Data Viewer

Video/Scaler T-PRLAUSC-0038T-PRLAUSM-0017MTK-DRV 2.0.25.0RFS : T-PRLAUS-200711272007-12-07PANEL : 46AMLN46A550P1FXZAEDID SuccessOption : 0311 1110 5120 8000 0c18 0010 0000 00DTP-COMP-0052DTP-LM-0064Date of purchase : 12/9/2007

Enhancement

SOUND

Dynamic Contrast

LNA+

Hotel Option

EDID

Expert Setting

- “T-TULPUS0-0025” and “T-TULPAUS5-C007” are firmware.......

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4. Troubleshooting

* How to enter the hidden factory mode. a. into the factory mode b. key input : 0 + 2 + 1 + 4 + exit c. select option byte menu -> in menu -> out menu (... hidden menu appear...) ** hidden menu : Video/Scaler, Enhancement, SOUND, Dynamic Contrast, LNA+- FBE3(image enhance IC) generate internal pattern

** hidden menu

6. Buttons operations withn Service Mode

Menu Full Menu Display/Move to Parent Menu

Direction Keys / Item Selection by Moving the Cursor

Direction Keys / Data Increase / Decrease for the Selected Item

Source Cycles through the active input source that are connected to the unit

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4. Troubleshooting

4-3-3 Factory Data

ADC

AV Calibration success

COMP Calibration success

PC Calibration success

HDMI Calibration success

ADC Target

1st_AV_Low 16 2nd_AV_Delta 2

1st_AV_High 220 2nd_COMP_R_Low 1

1st_AV_Delta 2 2nd_COMP_G_Low 1

1st_COMP_YLow 16 2nd_COMP_B_Low 1

1st_COMP_CbLow 128 2nd_COMP_High 235

1st_COMP_CrLow 128 2nd_COMP_Delta 1

1st_COMP_High 235 2st_PC_Low 1

1st_COMP_Delta 1 2st_PC_High 235

1st_PC_Low 4 2st_PC_Delta 1

1st_PC_High 235 2st_HDMI_Low 1

1st_PC_Delta 1 2st_HDMI_High 235

2nd_AV_R_Low 1 2st_HDMI_Delta 1

2nd_AV_G_Low 1

2nd_AV_B_Low 1

2nd_AV_High 235

ADC Result

1ST_Y_GH 124

1ST_Y_GL 135

1ST_Cb_BH 202

1ST_Cb_BL 184

1ST_Cr_RH 118

1ST_Cr_RL 184

2nd_R_L 113

2nd_G_L 113

2nd_B_L 113

2nd_R_H 164

2nd_G_H 164

2nd_B_H 164

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4. Troubleshooting

Option Byte

Factory Reset PC Mode Ident Auto Expert Adj OFF

Panel Option 46AM 7.5 IRE … WB Reset OFF

Model PEARL 7.5 IRE Offset … EER Reset

Watchdog Enable ON HDMI Hot Plug Enable

Spread Spectrum 1% HDMI Delay Time 600ms

Spectrum Period 1000ns HDMI Mode Ident Auto

Dimming Selection PWM_EXT Wall Calib.

RS-232 jack Debug Caption Level ON

Gamma 0.95 Watchdog Count 0

LVDS OUT Format

JEIDA Out Clock INV 0

Panel Display Time

0HR Out Clock Phase 0

Panel Time ResetSUB MICOM

DOWNOFF

Mute Time[RF] 600ms EPROM COUNT 594

Shop Mode[Aft.F/R]

OFF IC BUS STOP OFF

DDC WP OFF SIDE AV OPTION 46Inch

White Balance

Sub Brightness 128

R-Offset 512

G-Offset 512

B-Offset 512

Sub Contrast 128

R-Gain 512

G-Gain 512

B-Gain 512

W/B Movie

W/B Movie OFF NOR_Roffset …

Mode … NOR_Boffset …

Color Tone … C2_Rgain …

Msub Brightness … C2_Bgain …

Msub Contrast … C2_Roffset …

W1_Rgain … C2_Boffset …

W1_Bgain … Movie Gamma …

W1_Roffset … Movie Contrast …

W1_Boffset … Movie Brightness …

W2_Rgain … Movie Color …

W2_Bgain … Movie Sharpness …

W2_Roffset … Movie Tint …

W2_Boffset … Movie Backlight …

NOR_Rgain …

NOR_Bgain …

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4. Troubleshooting

EPA Standard

Standard Contrast 90

Standard Brightness 45

Standard Sharpness 50

Standard Color 50

Standard Tint 0

Standard Backlight 7

Video/Scaler

manual AGC OFF Gain2 5

MIN_HWIDTH 7 Gain3 5

MAX_HWIDTH 20 Gain4 5

TH_HIGH 7 Gain5 5

TH_SUPER 26 Gain6 10

Noise Level 101 Gain7 2

Low Gain 64 Gain8 10

Middle Gain 80 LTI_Gain 2

High Gain 80 ECTI_Gain 3

Local Low 64 PIP_CTI_GAIN 4

Local Middle 96 PIP_CTI_FGAIN 32

Local High 96 U delay 0

Limit Pos 64 V delay 0

Limit Neg 64 Color_mid_value 156

Gain1 5 Chip_th 40

Enhancement

Patt-Sel 0 M-Skin-UV -

B-Slope gain 80 M-Sub color -

B-Tilt min 30

B-Tilt-max 110

Lfunc-Basis 60

Hfunc-Basis 90

Mean-Offset1 50

Mean-Offset2 235

Mean-Slope 100

ACR-Offset 10

ACR-Th1 10

ACR-Th2 110

Skin-Enable ON

Skin-UV 128

Sub color 128

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4. Troubleshooting

SOUND

FM/AM Prescale 3ch

Carrier Mute ON

High Devision OFF

Pilot Low 1eh

Melody Volume fh

Audio Delay 10

STA Amp Vol. 36

STA Limit Att. 29h

STA Limit Rel. 9h

STA Post Scale fh

STA Speaker EQ 7fh

ON

Dynamic Contrast

Dynamic CE OFF

Dynamic Dimming ON

LBE Y_MEAN 708

LNA+

LNA PLUS ON

RF_dB0_TH 2

RF_dB1_TH 4

RF_dB2_TH 8

RF_dB3_TH 21

NR1_Coring 0

NR2_Coring 1

NR3_Coring 2

NR4_Coring 4

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4. Troubleshooting

Hotel Option

Hotel Mode ON

Power On Channel 3

Power On Band Air

Power On Volume 10

Max Volume 100

Panel Button Lock UnLock

Power On Source TV

EDID

EDID ON/OFF ON

ALL EDID Success

PC EDID Success

HDMI1 EDID Success

HDMI2 EDID Success

HDMI3 EDID …

EDID VERSION HDMI 1.3

CHECKSUM 0X0000

VisualTEST VisualTEST Disable

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4. Troubleshooting

4-4. White Balance - Calibration

4-4-1 White Balance -Calibration

1. Calibration

AV CalibrationComp CalibrationPC CalibrationHDMI Calibration

4-4-2 White Balance - Adjustment

3. W/B

(low light) (hight light)

Sub BrightR offsetG offsetB offset

Sub ContrastR gainG gainB gain

(W/B adjustment Condition refer next page)

4-5. White Ratio (Balance) Adjustment

You can adjust the white ratio in factory mode (1:Calibration, 3:White-Balance).

Since the adjustment value and the data value vary depending on the input source, you have to adjust these in CVBS, Component 1 and HDMI 1 modes.

The optimal values for each mode are configured by default. (Refer to Table 1, 2) It varies with Panel’s size and Specification.

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- Equipment : CS-210 - Pattern: MIK K-7256 #92 “Flat W/B Pattern” as standard - Use other equipment only after comparing the result with that of the Master equipment.

- Set Aging time : 60min

- Calibration and Manual setting for WB adjustment.

HDMI : Calibration at #24 Chessboard Pattern Manual adjustment #92 pattern (720p) COMP: Calibration at #24 Chessboard Pattern Manual adjustment at #92 pattern (720p) CVBS: Calibration at #24 Chessboard Pattern Manual adjustment at #92 pattern (NTSC)

- If finishing in HDMI mode, adjustment coordinate is almost same in AV/COMP mode.- White Balance Manual Adjustment

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4. Troubleshooting

Adjustment Coordinatex y Y(L) T(K) + MPCD

CVBS(NTSC)

H/L 266 288 -(Sub_CT:130) 12,000 (±0)

L/L 266 288 12.6cd/m2

(3.7 Ft) 12,000 (±0)

COMP(720P)

H/L 266 288 -(Sub_CT:130) 12,000 (±0)

L/L 266 288 13.0cd/m2

(3.8 Ft) 12,000 (±0)

HDMI(720P)

H/L 266 288 -(Sub_CT:130) 12,000 (±0)

L/L 266 288 13.0cd/m2

(3.8 Ft) 12,000 (±0)

- Adjustment Specification White Balance : High light (±2), Low light (±3) Luminance : High light (Don’t care), Low light (±0.2 Ft/L)

4-6. Servicing Information

4-6-1 USB Download MethodSamsung may offer upgrades for TV’s firmware in the future. Please contact the Samsung call center at 1-800-SAMSUNG (726-7864) to receive information about downloading upgrades and using a USB drive. Upgrades will be possible by connecting a USB drive to the USB port located on your TV.

Insert a USB drive containing the firmware upgrade into the WISELINK port on the side of the TV.

Press the MENU button to display the menu. Press the or button to select “Setup”, then press the ENTER button.

Press the or button to select “SW Upgrade”, then press the ENTER button.

Press the ENTER button. The message “Scanning for USB... It may take up to 30 seconds.” is displayed.

The message “Upgrade version XXXX to version XXXX? The system will be reset after upgrade.” is displayed. Press the or to select the “OK”, then press the ENTER button.

Please be careful to not disconnect the power or remove the USB drive while upgrades are being applied. The TV will turn off and turn on automatically after completing the firmware upgrade. Please check the firmware version after the upgrades are complete. When software is upgraded, video and audio settings you have made will return to their default (factory) settings. We recommend you write down your settings so that you can easily reset them after the upgrade.

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Samsung LN52A550P3FXZA Troubleshooting